fix: add --yes flag to bypass confirmation in /skills install and uninstall (#1647)

Fixes hanging when using /skills install or /skills uninstall from the
TUI — bare input() calls hang inside prompt_toolkit's event loop.

Changes:
- Add skip_confirm parameter to do_install() and do_uninstall()
- Separate --yes/-y (confirmation bypass) from --force (scan override)
  in both argparse and slash command handlers
- Update usage hint for /skills uninstall to show [--yes]

The original PR (#1595) accidentally deleted the install_from_quarantine()
call, which would have broken all installs. That bug is not present here.

Based on PR #1595 by 333Alden333.

Co-authored-by: 333Alden333 <333Alden333@users.noreply.github.com>

hermes_cli/main.py

@@ -2993,7 +2993,8 @@ For more help on a command:
     skills_install = skills_subparsers.add_parser("install", help="Install a skill")
     skills_install.add_argument("identifier", help="Skill identifier (e.g. openai/skills/skill-creator)")
     skills_install.add_argument("--category", default="", help="Category folder to install into")
-    skills_install.add_argument("--force", "--yes", "-y", dest="force", action="store_true", help="Install despite blocked scan verdict")
+    skills_install.add_argument("--force", action="store_true", help="Install despite blocked scan verdict")
+    skills_install.add_argument("--yes", "-y", action="store_true", help="Skip confirmation prompt (needed in TUI mode)")
 
     skills_inspect = skills_subparsers.add_parser("inspect", help="Preview a skill without installing")
     skills_inspect.add_argument("identifier", help="Skill identifier")